Water heater



FIG. 1 is a perspective view of a water heater, in accordance with the present design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a cross-sectional view of the water heater of FIG. 1 shown in the direction of line 8-8 of FIG. 2; the internal mechanism is not shown for the sake of clarity;

FIG. 9 is a cross-sectional view of the water heater of FIG. 1 shown in the direction of line 9-9 of FIG. 2; the internal mechanism is not shown for the sake of clarity; and,

FIG. 10 is a cross-sectional view of the water heater of FIG. 1 shown in the direction of line 10-10 of FIG. 2; the internal mechanism is not shown for the sake of clarity.

The broken lines shown in the drawings represent portions of the water heater that form no part of the claimed design. 

CLAIM The ornamental design for a water heater, as shown and described. 